TY  - BOOK
AU  - "Valacich, J.S."
AU  - "Hoffer, J. A. ""George, J.F."
TI  - Essentials of systems analysis and design
SN  - 81-203-2312-2
U1  - 4 
PY  - 2005///
CY  - New Delhi
PB  - "Prentice hall,"
KW  - Systems development
ER  -